6-to-9:

Or: 6-2-9 / six-to-nine , a spelling variant of 69 / sixty-nine , simultaneous mutual oragenitalism , either heterosexual or homosexual .
Synonyms: flip-flop ; double-header ; double marriage ; head-over-heels-(in-love) ; loop-de-loop ; (play) hoop-snake(s) ; p's-and-q's ; 69 ; soixante-neuf (French); vice-versa .

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